I hate enamels(save for metallic colors). I think the world will be a better place when they are gone.
Reasons why I hate enamels:
1. They don't coat evenly.
2. they don't lie flat(IE: you can see where a brush stroke overlaps).
3. They are impossible to get out of a paintbrush.
4. They take for forever to dry.
5. They STINK.
6. They're more toxic than darn near anything else.
7. Their thinner/cleaner/solvent costs money(where as water[Acrylic paint's thinner/cleaner/solvent] is virtually free.).
8. Their thinner will hurt plastic.
9. They're darn near impossible to remove(so for God's sake, don't make a mistake!).
10. Did I mention they're toxic?
Why I prefer Acrylics:
1. They lie flat.
2. They coat evenly(I've never EVER had unwanted texture with Acrylic paint. NEVER).
3. They come out of a paintbrush with a swish of water and some soap.
4. They dry within minutes(save for gloss paint, but that's a universal problem. Gloss always takes longer to dry).
5. You can't smell acrylic paint.
6. Compared to enamels, they're practically drinkable!
7. Water is virtually free.
8. Water doesn't hurt plastic.
9. Cotton swabs and alcohol take acrylic paint off, no sweat!
As for paint adhesion, I have never had a problem with Acyrlic paint adhering. Wether the plastic was dirty or not, Acrylic paint has never come off of my models!
In fact, the only time I've had paint adhesion problems is with enamels! Unless the plastic is so clean you could eat off it, my enamels stay VERY tacky!
I say, HURRAH FOR ACRYLIC PAINT!! DOWN WITH ENAMELS!!
I personally hope they get rid of every enamel paint save for metallic enamels(which I actually do like. But then again, I've never tried Acrylic metallics.)